Paper-cutting machine.



G. FOMM. PAPER CUTTING MACHINE. APPLICATION IILED APR. 24, 1908 Patented Nov. 17,1908.

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GEORG FOMM, OF LEIPZIG-REUDNITZ, GERMANY.

PAPER-CUTTING MACHINE.

Specification of Letters Patent.

Patented Nov. 17', 1908.

Original application filed. November 29, 1907, Serial No. 404,311. Divided and this application filed April .24, 1908. Serial No. 429,002.

To all whom it may concern: I

Be it known that I, GEORG FoMM, a subj ect of the King of Saxony, residing at Leipzig-Reudnitz, in the German Empire, have invented certain new and useful Improve ments in Paper-Cutting Machines, of which the following is a specification.

This invention relates to a machine for cutting or trimming books and other stacks of paper-sheets and the present application is a divisional one of my previous application Serial No. 404311 filed 29th Nov. 1907.

The object of the present invention is to allow of cutting three sides of the sheets without altering the position of the sheets or turning the table on which the sheets are placed.

An important feature of the invention lies in the fact that the knives work with a sliding or drawing out, which is alone adapted to produce clean-cut edges. The cutting of three sides is in most cases sufficient since one side which in the case of a book forms the back thereof is usually not cut.

The invention consists in arranging over a fixed table three diagonally guided knives, at right-angles to each other, and adapted to be so actuated that the two lateral knives cut simultaneously and the central knife cuts shortly before or after. The knives are adjustable relativelyto each other, or the central knife is non-adjustable and the other knives are adjustable relatively to each other and to said central knife.

A construction embodying the invention is shown in the annexed drawings, in which Figure 1 is a side elevation of the machine, Fig. 2 an end elevation, and Fig. 3 a plan-view.

The stack of paper 10 is placed on the table 8, which is preferably arranged so that it can be pulled out in front. The table has abutments thereon for adjusting the stack, which is held down by means of a screw-spindle or clamp 9. On three sides of the table are located knives 12, 13, and 54, the knife 12 being non-adjustable and the knives 13 and 54 adjustable in the longitudinal direction of the knife 12. Slide-blocks 14 and to which the knives 13 and 54 are fixed are movable in guides 15 and 56, and these guides are adjustable in a frame 17 by means of a spindle 16 capable of rotation by a hand wheel 18. The spindle 16 has right-hand and left-hand threads engaging the guides 15 and 56 respectively. The mechanism for operating the knives 12, 13 and 54 is of a known type and comprises a main shaft, cranks or eccentrics, and connecting rods. Rotation of the main shaft causes the lateral knives 13 and 54' to cut first. When these knives have returned to their normal position the knife 12 is moved downwards.

In the construction illustrated, rods 29 29 engage levers 30 30 pivoted at 31 31 integral with toothed segments 52 52 which mesh with small toothed wheels 33 33 on shafts 32 32 Larger toothed wheels 34 34 mesh with racks 35 35 fixed to the slideblocks. The rod 29 engages the pin 36 of a crank-disk 37 fixed to a'shaft 38, to which is fixed a toothed wheel 39, the latter being connected by a train of gear 40 to a pulley 41. The shaft 38 is connected by bevel gears 43 44 to a shaft 42 at right angles thereto and on said shaft 42 is mounted a wheel 45, half the circumference of which is toothed. The teeth of the wheel 45 mesh, during half the rotation of said wheel, with a pinion 46 mounted on a shaft 47 and having the same number of teeth. Two eccentrics 48, 48 are slidable on the shaft 47 but have splines engaging grooves 49 49 in said shaft to prevent their rotation relatively to the latter. The rods 29 for operating the knives l3 and 54 are connected to these eccentrics. Arms 50 and 50 of the guides 15 and 56 engage the eccentrics 48, 48 so that the latter move with the guides when same are displaced as aforesaid.

lVhile the two lateral knives 13 and 54 are cutting the paper the knife 12 moves upwards. The knife 12 does not descend until said lateral knives have returned to their normal positions.

What I claim as my invention and desire to secure by Letters Patent of the United States is 1 In a paper cutting machine the combination of a stationary work table, two knives disposed in planes parallel to each other, a third knife disposed in a plane rectangular to said parallel knives, means for positively moving all said knives towards and away from the surface of the table in inclined paths with a draw cut action and means for operating the parallel pair of knives in unison alternately with said third knife substantially as described.

2. In a paper cutting machine the combination of a stationary work table, two knives disposed in planes parallel to each other, a third knife disposed in a plane rectangular to said parallel knives means for positively moving all said knives towards and away from the surface of the table in inclined paths, with a draw-cut action, means whereby the third knife is caused to ascend while 0 the parallel knives are caused 'to descend and means for adjusting said parallel pair of knives towards and away from each other in the longitudinal direction of the aforesaid third knife substantially as described.

In witness whereof I have signed this 1-5 

